Sink



FIG. 1 is a perspective view taken from the top, front and right side of a sink showing our new design;

FIG. 2 is a top plan thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is an elevation of the right side thereof, the left side thereof being a mirror image of the right side thereof;

FIG. 5 is a bottom plan thereof; and,

FIG. 6 is a back elevation thereof. 

The ornamental design for a sink, as shown and described. 